Method for transporting asphalt mixture using heat-resistant resin sheet

Abstract

To provide a method for transporting an asphalt mixture using a heat-resistant resin sheet, which can transport the asphalt mixture safely and efficiently without soiling the loading platform of a truck for transporting the asphalt mixture. [Solution] A method for transporting asphalt mixture using heat-resistant resin sheets, in which the asphalt mixture is transported by a small truck to a site where the asphalt mixture will be paved, includes a heat-resistant resin sheet installation process in which heat-resistant resin sheets (bottom sheet 1 and side sheet 2) are attached to the bottom and sides of the bed of the small truck, an asphalt mixture loading process in which the asphalt mixture is loaded onto the bed with the heat-resistant resin sheets installed, and a transport process in which the asphalt mixture is transported by the small truck to the site where the asphalt mixture will be paved.

Description

[Technical Field]

[0001] The present invention relates to a method for transporting an asphalt mixture using a heat-resistant resin sheet. [Background technology]

[0002] In the past, when paving a small area with few square meters, the asphalt mixture was loaded onto the back of a small truck such as a 3-ton truck and transported to the site where the paving was to be carried out. For this reason, the asphalt mixture was transported while being kept warm using insulation sheets etc. to prevent it from cooling and hardening until it arrived at the site.

[0003] However, to prevent the asphalt mixture from cooling and hardening before arriving at the site, it needs to be heated to a fairly high temperature when it starts to be transported. For this reason, inexpensive disposable blue tarps are currently used as insulation sheets to prevent them from melting on contact.

[0004] Furthermore, when transporting asphalt mixture loaded onto the bed of a small truck such as a 3-ton truck, the small truck is often used under a rental or lease agreement. In this case, as shown in Figure 8, when the asphalt mixture is loaded and transported, the mixture sticks to the bed and becomes dirty, and after the truck is returned, a cleaning fee is charged. For this reason, when carrying out paving work, the current situation is that the rental fee includes the cleaning fee.

[0005] As an example of a thermal insulation sheet used for transporting asphalt mixture, Patent Document 1 discloses a thermal insulation sheet having a laminate made up of a first resin sheet, a second resin sheet, and a thermal insulation layer disposed between the first resin sheet and the second resin sheet and having higher thermal insulation properties than the first resin sheet and the second resin sheet (see claim 1 in the claims of Patent Document 1, paragraphs

[0039] to

[0092] of the specification, Figures 1 to 12, etc.).

[0006] The thermal insulation sheet described in Patent Document 1 is said to have high thermal insulation properties due to the presence of a laminate in which a thermal insulation layer is sandwiched between a first resin sheet and a second resin sheet. Furthermore, the thermal insulation sheet described in Patent Document 1 has through-holes that communicate with the interior of the laminate, allowing air trapped within the laminate to escape to the outside, so that the high thermal insulation properties of the laminate prevent the air within the thermal insulation sheet from thermally expanding and causing the thermal insulation sheet to swell, and the internal air can be quickly released through the through-holes, making the sheet easy to handle, such as when folded.

[0007] However, although the thermal insulation sheet described in Patent Document 1 is described as being used as a sheet for the bed of a truck, it is merely a thermal insulation sheet, and no consideration is given to the problem of the truck bed becoming soiled with asphalt mixture. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-93969 Summary of the Invention [Problem to be solved by the invention]

[0009] Therefore, the present invention was devised in consideration of the above-mentioned problems, and its object is to provide a method for transporting asphalt mixture using a heat-resistant resin sheet that can transport asphalt mixture safely and efficiently without soiling the bed of the transport truck. [Means for solving the problem]

[0010] The method for transporting asphalt mixture using a heat-resistant resin sheet according to the first invention is a method for transporting asphalt mixture using a heat-resistant resin sheet by transporting the asphalt mixture to a paving site by a small truck, and the method comprises the steps of: As a stain-proof sheet Heat-resistant resin sheet Connect them together with heat-resistant tapeThe method is characterized by comprising a heat-resistant resin sheet installation step in which a heat-resistant resin sheet is installed on the surface of the paving work, an asphalt mixture loading step in which asphalt mixture is loaded onto the loading platform on which the heat-resistant resin sheet is installed, and a transport step in which the asphalt mixture is transported by a small truck to the site where the paving work is to be carried out.

[0011] The method for transporting asphalt mixture using a heat-resistant resin sheet according to the second invention is characterized in that in the heat-resistant resin sheet installation step, a sheet made of polyethylene terephthalate having a melting point of 252°C or higher and a flash point of 322°C or higher is installed on the bottom and sides of the loading platform as the heat-resistant resin sheet in the heat-resistant resin sheet installation step.

[0012] The method for transporting asphalt mixture using heat-resistant resin sheets according to the third invention is characterized in that in the heat-resistant resin sheet installation step, the edges of the heat-resistant resin sheets are overlapped and installed so that the front sheet is on top.

[0013] The method for transporting asphalt mixture using a heat-resistant resin sheet according to the fourth invention is characterized in that in the heat-resistant resin sheet installation step, a channel material with a U-shaped cross section is fitted into the upper end of the gate plate of the loading platform, and the heat-resistant resin sheet installed on the side of the loading platform is sandwiched and fixed between the channel material and the gate plate.

[0014] The method for transporting asphalt mixture using a heat-resistant resin sheet according to the fifth invention is characterized in that in the heat-resistant resin sheet installation step, the heat-resistant resin sheet is adhered to the inner surface of the deck board of the deck as the side of the deck. [Effects of the Invention]

[0015] According to the first to fifth inventions, the asphalt mixture can be transported safely and efficiently without soiling the bed of the transport truck.

[0016] In particular, according to the second invention, a heat-resistant resin sheet made of polyethylene terephthalate, which has a melting point of 252°C or higher and a flash point of 322°C or higher, is used. Therefore, even if the asphalt mixture must be heated to a high temperature, the risk of the heat-resistant resin sheet melting or catching fire while the asphalt mixture is being transported can be eliminated.

[0017] In particular, according to the third invention, the edges of the heat-resistant resin sheets are placed on top of each other on the bottom surface of the truck bed, so that the weight of the asphalt mixture is applied to the joints between the heat-resistant resin sheets, reducing the risk of the heat-resistant resin sheets shifting during transport. Also, according to the third invention, the sheets are placed on top of each other with the front sheet on top, so that the asphalt mixture can be unloaded smoothly and without resistance when unloading forward.

[0018] In particular, according to the fourth invention, a channel material with a U-shaped cross section is fitted into the upper end of the tilt plate, and a heat-resistant resin sheet installed on the side of the loading platform is sandwiched and fixed between the channel material and the tilt plate, thereby reducing the risk of the heat-resistant resin sheet installed on the side of the loading platform shifting during transportation.

[0019] In particular, according to the fifth invention, a heat-resistant resin sheet is attached to the inner surface of the tailgate of the loading platform, eliminating the need to install a heat-resistant resin sheet on the side of the loading platform every time asphalt mixture is transported, thereby enabling safer work efficiency to be improved. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1(a) is a photograph showing the heating state of the asphalt mixture, and FIG. 1(b) is a photograph showing the temperature measurement state of the asphalt mixture. [Figure 2] Figure 2(a) is a photograph showing the progress of the heat-resistant resin sheet after heating the asphalt mixture, and Figure 2(b) is a photograph showing the condition of the heat-resistant resin sheet after it was removed after the asphalt mixture hardened. [Figure 3] FIG. 3 is a photograph showing a full view of each heat-resistant resin sheet to be installed on the bottom and sides of the bed of a small truck. [Figure 4] FIG. 4 is a photograph showing a full view of the bottom sheet (heat-resistant resin sheet) to be installed on the bottom of the bed of a small truck. [Figure 5] FIG. 5 is a photograph showing three bottom sheets (heat-resistant resin sheets) installed on the bottom of the bed of a small truck. [Figure 6] FIG. 6 is a photograph showing a full view of the side sheet (heat-resistant resin sheet) to be installed on the side of the loading platform of a small truck. [Figure 7] FIG. 7 is a photograph showing a side sheet (heat-resistant resin sheet) being installed on the side of the bed of a small truck. [Figure 8] Figure 8 is a photograph showing the state of contamination on the loading platform of a small truck after the asphalt mixture was loaded onto the loading platform and transported as usual. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, one embodiment of a method for transporting an asphalt mixture using a heat-resistant resin sheet according to the present invention will be described in detail with reference to the drawings.

[0022] <Heat-resistant resin sheet> First, a heat-resistant resin sheet used in the method for transporting an asphalt mixture according to an embodiment of the present invention will be described.

[0023] The heat-resistant resin sheet used in the method for transporting asphalt mixture according to this embodiment is Ertalite (registered trademark) (PET-P: basic grade) manufactured by Mitsubishi Chemical Advanced Materials Corp. This Ertalite (registered trademark) (PET-P: basic grade) is a plate-shaped sheet material made of polyethylene terephthalate that has a continuous use temperature of approximately 100°C and a tensile strength of approximately 84 MPa, giving it high mechanical strength and dimensional stability.

[0024] This heat-resistant resin sheet is a resin sheet made of PET resin with a base of 8 mm thick x 610 mm wide x 1000 mm long, and is cut appropriately to fit the dimensions of the truck bed. Because the heat-resistant resin sheet is made of polyethylene terephthalate (PET resin), it has insulating properties, high chemical resistance, and is highly resistant to organic solvents, oils, and weak acids. Therefore, the heat-resistant resin sheet of this embodiment contains weakly acidic groups such as crude oil-derived carboxylic acids and naphthenic acids, making it suitable for transporting asphalt mixtures that use weakly acidic asphalt as a binder.

[0025] Furthermore, because this heat-resistant resin sheet is made of PET resin, it has extremely high heat resistance, even among resin sheets, with physical and chemical properties such as a melting point of 252°C, a flash point of 322°C, and an ignition point of 500°C (ASTM D 1929).

[0026] The heat-resistant resin sheet used in the method for transporting asphalt mixture according to this embodiment has been described using Mitsubishi Chemical Advanced Materials Corporation's Eltalite (registered trademark) (PET-P: basic grade), but it goes without saying that any resin sheet that has a higher thermal insulation value than metal and can be in contact with asphalt mixture for a certain period of time at a continuous use temperature of about 100°C can be used.

[0027] [Heating test] Next, using Figures 1 and 2, we will explain a heating test conducted to confirm the heat resistance of the heat-resistant resin sheet made of the aforementioned Eltalite (registered trademark) manufactured by Mitsubishi Chemical Advanced Materials Corporation. Figure 1(a) is a photograph showing the heating status of an asphalt mixture, and Figure 1(b) is a photograph showing the temperature measurement status of the asphalt mixture. Furthermore, Figure 2(a) is a photograph showing the progress of the heat-resistant resin sheet after heating the asphalt mixture, and Figure 2(b) is a photograph showing the condition of the heat-resistant resin sheet removed after the asphalt mixture hardened.

[0028] As shown in Figures 1 and 2, the asphalt mixture was heated and the heat-resistant resin sheet was observed over time. As shown in Figure 2(b), even when the heat-resistant resin sheet was visually inspected after the asphalt mixture had cooled and hardened, no melting or other abnormalities were observed in the heat-resistant resin sheet. Therefore, this heating test confirmed that the heat-resistant resin sheet made of Eltalite (registered trademark) manufactured by Mitsubishi Chemical Advanced Materials Corporation has sufficient heat resistance to be transported in contact with asphalt mixture.

[0029] <How to transport asphalt mixture> Next, a method for transporting an asphalt mixture using a heat-resistant resin sheet according to the present invention (hereinafter simply referred to as a method for transporting an asphalt mixture) will be described with reference to Figures 3 to 8. The method for transporting an asphalt mixture according to this embodiment is a method for transporting the asphalt mixture to a paving site (site) using a small truck, and includes a heat-resistant resin sheet installation step, an asphalt mixture loading step, a transport step, and an asphalt mixture unloading step. Note that there are various classifications for small trucks, but this refers to a truck with a gross vehicle weight of less than 5.0 t (tons) and a maximum load capacity of less than 3.0 t. In this embodiment, a 3-ton truck specification applied to a 3-ton truck with a maximum load capacity of 3.0 t will be described as an example of a small truck.

[0030] (Heat-resistant resin sheet installation process) First, in the method for transporting asphalt mixture according to this embodiment, as shown in Figures 3 to 7, a heat-resistant resin sheet installation step is performed in which heat-resistant resin sheets made of polyethylene terephthalate as described above are attached and installed as anti-fouling sheets on the bottom and sides of the bed of a small truck. Figure 3 is a photograph showing a full view of each heat-resistant resin sheet to be installed on the bottom and sides of the bed of the small truck. Figure 4 is a photograph showing a full view of the bottom sheet 1 (heat-resistant resin sheet) to be installed on the bottom of the bed of the small truck, and Figure 5 is a photograph showing three bottom sheets 1 (heat-resistant resin sheets) installed on the bottom of the bed of the small truck. The arrow in Figure 3 indicates the direction of travel of the truck.

[0031] Specifically, in this heat-resistant resin sheet installation process, as shown in Figures 3 to 5, a heat-resistant resin sheet measuring 8 mm thick x 610 mm wide x 1000 mm long is installed on the bottom of the bed of a small truck as the bottom sheet 1, facing from front to rear in the direction of travel, with the edges of the heat-resistant resin sheets overlapping and the front sheet on top. This is because the weight of the asphalt mixture is applied to the joints between the bottom sheets 1, reducing the risk of the bottom sheets 1 shifting during transport in the small truck.

[0032] As shown in Figures 3 to 5, the bottom sheets 1 to be placed on the bottom of the loading platform are preferably connected together using heat-resistant tape T, which is made by laminating a highly heat-resistant adhesive to aluminum foil or glass fiber cloth, such as aluminum heat-resistant tape, glass cloth tape, or ultra-heat-resistant aluminum foil adhesive tape. This also reduces the risk of the bottom sheets 1 slipping apart during transport. Preferred heat-resistant adhesives include silicone-based adhesives, which are stable up to approximately 200-260°C, and acrylic-based adhesives, which are stable up to approximately 100-150°C. However, inorganic or special resin-based adhesives are also applicable, although they are more expensive.

[0033] In this heat-resistant resin sheet installation process, after the bottom sheet 1 is installed, a heat-resistant resin sheet measuring 8 mm thick, 610 mm wide, and 1000 mm long is cut and installed as the side sheet 2 on the side of the loading platform. Specifically, as shown in Figures 6 and 7, a channel member 3 with a U-shaped cross section is preferably fitted to the upper end of the gate plate of the loading platform of the small truck, and the side sheet 2 installed on the side of the loading platform is sandwiched and fixed between the channel member 3 and the gate plate. This is because it reduces the risk of the side sheet 2 installed on the side of the loading platform being warped or shifted during transportation. Figure 6 is a photograph showing the entire side sheet 2 (heat-resistant resin sheet) installed on the side of the loading platform of the small truck, and Figure 7 is a photograph showing the side sheet 2 (heat-resistant resin sheet) being installed on the side of the loading platform of the small truck.

[0034] However, in this heat-resistant resin sheet installation process, the side sheet 2 may be a heat-resistant resin sheet cut to a predetermined size and attached to the inner surface of the gate plate of the loading platform using a highly heat-resistant adhesive. This eliminates the need to install a heat-resistant resin sheet on the side of the loading platform every time the asphalt mixture is transported, which can improve safety and work efficiency, and further reduces the risk of the side sheet 2 shifting during transport.

[0035] (Asphalt mixture loading process) Next, in the asphalt mixture transporting method according to this embodiment, as described above, an asphalt mixture loading process is carried out in which the asphalt mixture is loaded onto the bed of a small truck on which heat-resistant resin sheets are installed as the bottom sheet 1 and side sheets 2.

[0036] (Transportation process) Next, in the method for transporting an asphalt mixture according to this embodiment, a transporting step is carried out in which the asphalt mixture is loaded onto the bed of a small truck and transported to a site where the asphalt mixture will be paved.

[0037] As mentioned above, the anti-fouling sheets (bottom sheet 1 and side sheets 2) on the loading platform are heat-resistant resin sheets made of PET resin, which has an extremely high heat resistance, with a continuous use temperature of approximately 100°C, a melting point of 252°C, a flash point of 322°C, and an ignition point of 500°C (ASTM D 1929). Therefore, even if the asphalt mixture loaded on the loading platform must be heated to high temperatures, there is no risk of the bottom sheet 1 and side sheets 2 melting or catching fire during transportation.

[0038] (Unloading process) Then, in the method for transporting asphalt mixture according to this embodiment, an unloading process is carried out in which the asphalt mixture is unloaded from the bed of the small truck upon arrival at the paving site. As described above, the bottom sheet 1 and the side sheets 2 are provided with heat-resistant resin sheets made of PET resin, which not only has heat resistance but also has extremely high sliding properties. Therefore, even when the asphalt mixture is unloaded using a shovel or the like, even if the shovel or the like repeatedly hits the bottom sheet 1 or the side sheet 2, the durability is high and the bottom sheet 1 and the side sheet 2 can be used repeatedly for a long period of time.

[0039] As mentioned above, the edges of the bottom sheets 1 are overlapped on the bottom surface of the loading platform, with the front bottom sheet 1 on top, and the bottom sheets 1 are connected with heat-resistant tape T. Therefore, even during the actual unloading process, when the asphalt mixture loaded on the bottom sheets 1 is scraped out with a shovel or the like to be unloaded, the unloading can be done smoothly and without resistance.

[0040] By completing this step, the asphalt mixture transporting operation using the asphalt mixture transporting method using the heat-resistant resin sheet according to this embodiment is completed.

[0041] According to the method for transporting asphalt mixture using heat-resistant resin sheets of the present embodiment described above, bottom sheet 1 is installed on the bottom of the loading platform and side sheets 2 are installed on the sides of the loading platform as anti-fouling sheets, preventing the loading platform of the truck from being soiled with asphalt. Furthermore, the anti-fouling sheets are heat-resistant resin sheets made of PET resin, which has extremely high heat resistance with a continuous use temperature of approximately 100°C, a melting point of 252°C, a flash point of 322°C, and an ignition point of 500°C (ASTM D 1929), allowing for safe transportation of the asphalt mixture. Furthermore, according to the method for transporting asphalt mixture of the present embodiment, the anti-fouling sheets can be installed simply by laying out plates of heat-resistant resin sheets of a predetermined size or by sandwiching and securing them between channel members 3. This allows for efficient installation in a short time, preventing soiling of the loading platform and allowing for efficient transportation of the asphalt mixture.

[0042] Furthermore, according to the method for transporting asphalt mixture according to this embodiment, the bottom sheet 1 is placed on the bottom surface of the bed of a small truck by overlapping the edges of the heat-resistant resin sheets with the front sheet facing up, and is connected by bonding with heat-resistant tape T. Therefore, even when the asphalt mixture loaded on the bottom sheet 1 is unloaded by scraping it out with a shovel or the like, it can be unloaded smoothly without resistance.

[0043] Furthermore, according to the method for transporting asphalt mixture of this embodiment, a channel material 3 with a U-shaped cross section is fitted into the upper end of the tailgate of the bed of a small truck, and the side sheet 2 installed on the side of the bed is sandwiched and fixed between the channel material 3 and the tailgate, thereby reducing the risk of the side sheet 2 installed on the side of the bed bending or shifting during transportation.

[0044] Furthermore, according to the method for transporting asphalt mixture according to this embodiment, heat-resistant resin sheets made of PET resin, which not only have heat resistance but also have extremely high sliding properties, are installed on the bottom sheet 1 and the side sheets 2. Therefore, even if the shovel or the like repeatedly hits the bottom sheet 1 or the side sheets 2 when unloading the asphalt mixture using a shovel or the like, the bottom sheet 1 and the side sheets 2 are highly durable, and can be used repeatedly for a long period of time.

[0045] Although the method for transporting asphalt mixture according to the present embodiment has been described in detail above, the above-described and illustrated embodiments are merely specific embodiments for carrying out the present invention, and therefore the technical scope of the present invention should not be construed as being limited by them. [Explanation of symbols]

[0046] 1: Bottom sheet (heat-resistant resin sheet) 2: Side sheet (heat-resistant resin sheet) 3: Channel material T: Heat-resistant tape

Claims

1. A method for transporting an asphalt mixture using a heat-resistant resin sheet, in which the asphalt mixture is transported to a paving site by a small truck, comprising: a heat-resistant resin sheet installation step of installing heat-resistant resin sheets as antifouling sheets on the bottom and side surfaces of the bed of the small truck by bonding and connecting them with heat-resistant tape; an asphalt mixture loading step of loading an asphalt mixture onto the loading platform on which the heat-resistant resin sheet is installed; and a transportation process for transporting the asphalt mixture to the paving site by small truck. A method for transporting asphalt mixture using a heat-resistant resin sheet, characterized by:

2. In the heat-resistant resin sheet installation step, a sheet made of polyethylene terephthalate having a melting point of 252°C or higher and a flash point of 322°C or higher is installed as the heat-resistant resin sheet on the bottom and side surfaces of the loading platform. A method for transporting asphalt mixture using the heat-resistant resin sheet according to claim 1.

3. In the heat-resistant resin sheet installation step, the edges of the heat-resistant resin sheets are overlapped and installed so that the front sheet is on top. A method for transporting asphalt mixture using the heat-resistant resin sheet according to claim 1.

4. In the heat-resistant resin sheet installation step, a channel member having a U-shaped cross section is fitted to the upper end of the gate plate of the loading platform, and the heat-resistant resin sheet installed on the side of the loading platform is sandwiched and fixed between the channel member and the gate plate. A method for transporting asphalt mixture using the heat-resistant resin sheet according to claim 1.

5. In the heat-resistant resin sheet installation step, the heat-resistant resin sheet is attached to the inner surface of the gate plate of the loading platform as the side surface of the loading platform. A method for transporting asphalt mixture using the heat-resistant resin sheet according to claim 1.

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